Simply call up the relevant date and appointment at https://eu5.bookingkit.de/calendar/index and click on the button “Email to all participants”. In the text editor which opens, you can not only format the wording you want to send, but also insert your own links, e.g. to important documents on your website.
Do you have any questions about this? At firstname.lastname@example.org we are happy to help you with words and deeds.